不同层理煤CO2驱替CH4及封存效果分析

doi:10.16265/j.cnki.issn1003-3033.2026.04.1551

摘要/Abstract

摘要：

为研究煤的层理角度对提升CO₂强化煤层气开采效率的影响,以山西晋中寺家庄6矿煤样为研究对象,利用渗流驱替试验系统,开展不同层理角度下CO₂驱替CH₄试验研究,分析驱替过程中排出气体组分、气体流量、驱替效率、封存能力等随层理角度的变化特征。结果表明:层理面和渗流方向夹角的增大可显著延长CO₂的突破时间,层理角度越大,出口气体组分变化速率越慢。进口与出口流量大小关系均表现出0>30>60>90°的特征,出口CH₄流量大小关系在试验前期与出口流量一致,后期转变为90>60>30>0°。驱替第1阶段结束时,CH₄采收率表现为0>30>60>90°,第2阶段结束时,CH₄采收率大小表现为30>0>60>90°,整个驱替过程结束时,30°层理煤的CH₄采收率达到最大值,为67%。30°层理煤的驱替置换比最小,置换效果最好。整个驱替过程中CO₂穿透率始终保持0>30>60>90°的特征,且非0°层理煤在驱替结束时对CO₂的吸附仍未达到平衡。此外,90°层理煤的封存率达到81.59%,封存效果最好。

关键词: 层理角度, CO₂驱替CH₄, 采收率, 驱替置换, 封存效果

Abstract:

To investigate the influence of coal bedding angle on enhancing CO₂ injection-enhanced coalbed methane recovery efficiency, coal samples from Mine 6 in Sijiazhuang, Jinzhong, Shanxi Province were studied. Using a flow displacement experimental system, CO₂ displacement of CH₄ experiments were conducted under different bedding angles. The variation patterns of displaced gas composition, gas flow rate, displacement efficiency, and storage capacity with bedding angle were analyzed during the displacement process. The results indicate: An increase in the angle between the bedding plane and the seepage direction significantly prolongs the breakthrough time of CO₂. The steeper the bedding angle, the slower the rate of change in outlet gas composition. The relationship between inlet and outlet flow rates follows the pattern 0 > 30 > 60 > 90°. The relationship for outlet CH₄ flow rate aligns with outlet flow rate in the early stage of the experiment, shifting to 90 > 60 > 30 > 0° in the later stage. At the end of the first displacement stage, CH₄ recovery rates followed 0 > 30 > 60 > 90°. By the end of the second stage, recovery rates shifted to 30 > 0 > 60 > 90°. Upon completion of the entire displacement process, the 30°-layered coal achieved the highest CH₄ recovery rate of 67%. The 30° bedded coal exhibited the lowest displacement ratio and the most effective replacement. Throughout the displacement process, CO₂ penetration consistently followed the pattern 0 > 30 > 60 > 90°, and non-0° bedded coal had not reached adsorption equilibrium for CO₂ by the end of displacement. Furthermore, the 90° bed coal achieved a storage rate of 81.59%, demonstrating the best storage effectiveness. These findings provide crucial insights for optimizing CO₂ injection strategies to enhance coalbed methane extraction.

Key words: bedding angles, CO₂ displacement of CH₄, recovery rate, displacement ratio, storage effectiveness

中图分类号:

X936

梁冰, 张世垚, 孙维吉, 张肖洋, 聂涛. 不同层理煤CO₂驱替CH₄及封存效果分析[J]. 中国安全科学学报, 2026, 36(4): 65-74.

Liang Bing, Zhang Shiyao, Sun Weiji, Zhang Xiaoyang, Nie Tao. Analysis of CO₂ displacement CH₄ and storage effect in different stratified coals[J]. China Safety Science Journal, 2026, 36(4): 65-74.

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编号	角度/(°)	尺寸/mm×mm	质量/g	波速/(km/s)	孔隙净容积/mL	渗透率/×10^-5μm²
A_-0	0	Φ50.12×100.22	264.5	0.945	21.44	8.392 0
A_-30	30	Φ49.78×99.46	268.6	0.887	22.81	7.057 0
A_-60	60	Φ50.04×100.20	266.4	0.706	19.32	6.587 9
A_-90	90	Φ50.14×100.12	261.2	0.641	21.30	2.538 0

不同层理煤CO₂驱替CH₄及封存效果分析

Analysis of CO₂ displacement CH₄ and storage effect in different stratified coals

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层理角度/(°)	时间/min
层理角度/(°)	第1阶段	第2阶段	第3阶段
0	10	90	30
30	15	165	30
60	20	200	30
90	30	265	30

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